feat: rename RICH_TEXT_V2 → RICH_TEXT in codebase (keep DB value) (#18628)

## Summary

- Renames the `FieldMetadataType` enum key from `RICH_TEXT_V2` to
`RICH_TEXT` across the entire codebase, while keeping the underlying
string value as `'RICH_TEXT_V2'` to maintain PostgreSQL database
compatibility
- Renames all related types, guards, hooks, components, and files from
`*RichTextV2*` / `*rich-text-v2*` to `*RichText*` / `*rich-text*` (e.g.
`FormRichTextV2FieldInput` → `FormRichTextFieldInput`,
`isFieldRichTextV2` → `isFieldRichText`)
- Updates generated files (GraphQL schema, SDK types) to use the new key
while preserving the `RICH_TEXT_V2` string value for DB/API layer
- Updates i18n locale files, test snapshots, and integration tests to
reflect the rename

## Context

The legacy `RICH_TEXT` (V1) field type was deprecated and migrated to
`TEXT` in a previous PR (#18623). With V1 gone, the `RICH_TEXT_V2`
naming is no longer necessary — `RICH_TEXT` is now the canonical name.
The DB enum value stays `'RICH_TEXT_V2'` to avoid confusion with the
just-deprecated V1 type and to prevent a database migration.

## Test plan

- [x] `twenty-server` typecheck passes
- [x] `twenty-front` typecheck passes (only pre-existing Apollo client
errors remain)
- [x] `twenty-server` lint passes
- [x] `twenty-front` lint passes
- [x] `twenty-shared` build passes
- [ ] CI passes


Made with [Cursor](https://cursor.com)

packages/twenty-shared/src/utils/fieldMetadata/__tests__/isFieldMetadataTextKind.test.ts

@@ -2,7 +2,7 @@ import { FieldMetadataType } from '@/types';
 import { isFieldMetadataTextKind } from '../isFieldMetadataTextKind';
 
 describe('isFieldMetadataTextKind', () => {
-  it.each([FieldMetadataType.TEXT, FieldMetadataType.RICH_TEXT_V2])(
+  it.each([FieldMetadataType.TEXT, FieldMetadataType.RICH_TEXT])(
     'should return true for %s',
     (type) => {
       expect(isFieldMetadataTextKind(type)).toBe(true);

packages/twenty-shared/src/utils/fieldMetadata/isFieldMetadataTextKind.ts

@@ -2,7 +2,7 @@ import { FieldMetadataType } from '@/types';
 
 const TEXT_FIELD_TYPES: FieldMetadataType[] = [
   FieldMetadataType.TEXT,
-  FieldMetadataType.RICH_TEXT_V2,
+  FieldMetadataType.RICH_TEXT,
 ];
 
 export const isFieldMetadataTextKind = (